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computer just started randomly rebooting

I have an old Dell Dimension 4600 w/ WinXP, 2.8ghz processor and 2.5 gigs ram. All things considered, the computer was been running fine. I haven't added/removed any hardware or software recently, but while listening to iTunes and browsing via Firefox the thing rebooted... was fine for 30 minutes before rebooting and now this seems to be a habit (uptime has been anywhere from 3 minutes to 1hr).

The PS fan is running, and doesn't appear hot, stressed, or overworked. The memory has been fine for some time... I suspected some months ago that one module was bad/faulty, but I took it out this evening and still got the random rebooting.

When I checked the Event Viewer I noticed that every time it crashed there was the same error:

Event Type: ErrorEvent Source: Service Control ManagerEvent Category: NoneEvent ID: 7001Date: 10/7/2008Time: 7:35:53 PMUser: N/AComputer: Description:The Print Spooler service depends on the LexBce Server service which failed to start because of the following error: The service cannot be started, either because it is disabled or because it has no enabled devices associated with it.

There are no ?'s or !'s in the Device Manager, fwiw. I've tried Google but to no avail. I don't have a printer and don't need one, so if deleting all printer-related drivers would help I can definitely do that if needed. But I don't know what a Print Spooler service is nor a LexBce Server service, etc...

Any ideas?

Edit: I've also run AdAware & Spybot and removed whatever popped up... though SpyBot found some stuff it was apparently unable to remove. Either way, the descriptions of them seemed relatively benign, some data tracker stuff and so forth -- nothing that seemed like it would force re-starts randomly. Maybe I'm wrong though and mal/spyware is to blame still, I'm not sure.

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You can check to see if everything is running the way its supposed to by using the manufactures diagnostic CD. In your case (Dimension 4600) can be found here Diagnostic CD From there you can create a bootable CD that will perform complete test on your system and hopefully point out an issue.

In regards to your error it is referring to a printing issue. It may be that the spooler service is trying to run. You can stop the spooling service by doing the following at the command prompt:

START>RUN>CMD ( brings you to the command prompt)Then enter the following comands:

net stop spooler
exit

Also LexBce Server is a printing software that Dell pre-installs it is actually quite annoying. Microsoft describes here how to remove it.Removing LexBce I dont think you need it as you stated here:

I don't have a printer and don't need one, so if deleting all printer-related drivers would help I can definitely do that if needed.

Thanks for the help so far. I checked the Lexmark service per the Windows website, but it was already disabled and not running. I used cmd to check the print spooler is also said it wasn't running either. I will have to look into making a diagnostic CD tomorrow.